Invite collaborators, adjust permissions, and (if needed) publish before sharing externally.
Open Files > select a file > click on a file name to view File details.
Click +Share (beside Create Task).
In Invite collaborators, add names/emails and set access (Editor, Viewer, or Commenter where available).
To invite Outside collaborators, first Publish the document; then add external emails.
Click Invite.
(Optional) Click Copy link to share a direct link.
Tip: You can manage access later from the Collaborators with access section in the File preview.